On Mon, Jan 22, 2024 at 03:54:32PM +0000, Alex Bennée wrote:
> Ilya Leoshkevich <i...@linux.ibm.com> writes:
>
> > Make sure that qemu gdbstub, like gdbserver, allows reading from and
> > writing to PROT_NONE pages.
> >
> > Signed-off-by: Ilya Leoshkevich <i...@linux.ibm.com>
> > ---
> > tests/tcg/multiarch/Makefile.target | 9 +++++-
> > tests/tcg/multiarch/gdbstub/prot-none.py | 22 +++++++++++++
> > tests/tcg/multiarch/prot-none.c | 40 ++++++++++++++++++++++++
> > 3 files changed, 70 insertions(+), 1 deletion(-)
> > create mode 100644 tests/tcg/multiarch/gdbstub/prot-none.py
> > create mode 100644 tests/tcg/multiarch/prot-none.c
[...]
> > +def run_test():
> > + """Run through the tests one by one"""
> > + gdb.Breakpoint("break_here")
> > + gdb.execute("continue")
> > + val = gdb.parse_and_eval("*(char[2] *)q").string()
>
> Better traceback:
>
> Breakpoint 1, break_here (q=0x400000802fff) at
> /home/alex/lsrc/qemu.git/tests/tcg/multiarch/prot-none.c:14
> 14 }
> GDB Exception:
> Traceback (most recent call last):
> File "/home/alex/lsrc/qemu.git/tests/guest-debug/test_gdbstub.py", line
> 42, in main
> test()
> File "./tests/tcg/multiarch/gdbstub/prot-none.py", line 14, in run_test
> val = gdb.parse_and_eval("*(char[2] *)q").string()
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> gdb.MemoryError: Cannot access memory at address 0x400000802fff
> Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> (InteractiveConsole)
> >>>
Thanks for the debug output. This shows that the feature being tested
doesn't work (the value of `q` looks sane to me). May I ask what host
distro is this? I tried on x86_64 Fedora 38 and x86_64 Ubuntu 22.04 so
far, and the test was successful.
[...]
